With more than 750,000 human-edited definitions, Acronym Finder is the world's largest and most comprehensive dictionary of acronyms, abbreviations, and initialisms.
This database provides indexing and abstracts from more than 4,000 current serial and non-serial titles, including content from AIAA and NASA.
The American Memory project from the Library of Congress provides at least 261 discrete digital collections in 18 broad topical areas: Advertising; African American History; Architecture, Landscape; Cities, Towns; Culture, Folklife; Environment, Conservation; Government, Law; Immigration, American Expansion; Literature; Maps; Native American History; Performing Arts, Music; Presidents; Religion; Sports, Recreation; Technology, Industry; War, Military; and Women's History.
The landmark American National Biography offers portraits of more than 17,400 men and women -- from all eras and walks of life -- whose lives have shaped the nation.
Archive Finder brings together ArchivesUSA and the cumulative index to the National Inventory of Documentary Sources in the UK and Ireland (NIDS UK/Ireland).
Online access to nearly a million descriptions of archival collections owned by thousands of libraries, museums, historical societies and archives worldwide.
Started in August 1991, arXiv.org (formerly xxx.lanl.gov) is a highly-automated electronic archive and distribution server for research articles in the areas of physics, mathematics, computer science, nonlinear sciences, quantitative biology and statistics.
This web site provides a searchable directory to over 6000 freely available online bilingual and multilingual dictionaries and glossaries.
This is an indispensable research tool for medievalists of all disciplines.
LibDex is a website which serves as a directory of libraries of all types (though it appears not to be comprehensive in its coverage) in dozens of countries around the world.
A comprehensive resource for Library and Information Science research, this EBSCO database provides full text articles from more than 430 LIS journals, indexing for hundreds more and selected full text monographs.
The Library of Congress's home page, linking to an extraordinary wealth of information including the Library's catalogs and its very significant digital collections.
LibriVox provides free audiobooks from the public domain (no longer subject to copyright restrictions).
The Lyell Collection, created to mark the Geological Society of London's 200th anniversary in 2007, represents one of the largest integrated collections of online Earth science literature available. Bringing together key journals, Special Publications and Society book series on a single electronic platform, the Lyell Collection is a unique resource for researcher and student alike.